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New challenge in the speciation of selenium. Measurement and production on nano selenium

Conference:

Abstract

Complete text of publication follows. We have found that several species of probiotic bacteria also used in food industry for making yogurts is capable of producing spherical elemental selenium nanospheres having an average diameter in the range of 50-500 nm when 1-1000 mg/L selenium was added to the medium in the form of selenite ions. Elemental selenium produced thereby has a high degree of purity, is spherical, and its size and crystalline form depends on the bacterium species applied. We have found that some species of the probiotic yogurt bacteria (e.g. Bifidobacterium bifidum or Bifidobacterium longum) are capable of producing the grey crystalline form of elemental selenium which is so far unprecedented in the art for any bacteria capable of producing elemental selenium nanoparticles. Our finding, therefore, enables the first time the development of economical industrial bacterial fermentation based processes for the production of a high quality elemental selenium material comprising uniformly sized grey or red nanospheres having an average diameter in the range of 50-500 nm. The size and the crystalline form of the produced nanosized (50-500 nm) spherical particles is defined by the selected microorganism. This genetic pre-determination result in reproducible production of a material having individual characteristics  More>>
Authors:
Prokisch, J; Sztrik, A; Babka, B; Zommara, M; Daroczi, L [1] 
  1. Debrecen University, Centre for Agricultural Sciences and Engineering, Debrecen (Hungary). Institute of Bio- and Environmental Energetics
Publication Date:
Jul 01, 2009
Product Type:
Conference
Report Number:
INIS-HU-015
Resource Relation:
Conference: 36. Colloquium Spectroscopicum Internationale, Budapest (Hungary), 30 Aug - 3 Sep 2009; Related Information: In: 36. Colloquium Spectroscopicum Internationale, [373] pages.
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BACTERIA; BIOLOGICAL EVOLUTION; FERMENTATION; HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY; RAW MATERIALS; SELENIUM; BIOCONVERSION; CHROMATOGRAPHY; ELEMENTS; EVOLUTION; LIQUID COLUMN CHROMATOGRAPHY; MATERIALS; MICROORGANISMS; SEMIMETALS; SEPARATION PROCESSES
OSTI ID:
21432537
Research Organizations:
Hungarian Chemical Society (Hungary); Hungarian Spectrochemical Association of Hungarian Chemical Society (Hungary); Eoetvoes Lorand University (Hungary)
Country of Origin:
Hungary
Language:
English
Other Identifying Numbers:
TRN: HU1100333018808
Availability:
Available from http://www.csixxxvi.org/
Submitting Site:
INIS
Size:
page(s) 56
Announcement Date:
Jun 03, 2011

Conference:

Citation Formats

Prokisch, J, Sztrik, A, Babka, B, Zommara, M, and Daroczi, L. New challenge in the speciation of selenium. Measurement and production on nano selenium. Hungary: N. p., 2009. Web.
Prokisch, J, Sztrik, A, Babka, B, Zommara, M, & Daroczi, L. New challenge in the speciation of selenium. Measurement and production on nano selenium. Hungary.
Prokisch, J, Sztrik, A, Babka, B, Zommara, M, and Daroczi, L. 2009. "New challenge in the speciation of selenium. Measurement and production on nano selenium." Hungary.
@misc{etde_21432537,
title = {New challenge in the speciation of selenium. Measurement and production on nano selenium}
author = {Prokisch, J, Sztrik, A, Babka, B, Zommara, M, and Daroczi, L}
abstractNote = {Complete text of publication follows. We have found that several species of probiotic bacteria also used in food industry for making yogurts is capable of producing spherical elemental selenium nanospheres having an average diameter in the range of 50-500 nm when 1-1000 mg/L selenium was added to the medium in the form of selenite ions. Elemental selenium produced thereby has a high degree of purity, is spherical, and its size and crystalline form depends on the bacterium species applied. We have found that some species of the probiotic yogurt bacteria (e.g. Bifidobacterium bifidum or Bifidobacterium longum) are capable of producing the grey crystalline form of elemental selenium which is so far unprecedented in the art for any bacteria capable of producing elemental selenium nanoparticles. Our finding, therefore, enables the first time the development of economical industrial bacterial fermentation based processes for the production of a high quality elemental selenium material comprising uniformly sized grey or red nanospheres having an average diameter in the range of 50-500 nm. The size and the crystalline form of the produced nanosized (50-500 nm) spherical particles is defined by the selected microorganism. This genetic pre-determination result in reproducible production of a material having individual characteristics which can be used in numerous fields of industry and research. The produced nano selenium could be a good raw material for a production of certified reference materials. The measurement of the produced elemental nanoselenium is a new challenge for the speciation analysis. A sample preparation and measurement method was developed and investigated for the analysis of different selenium forms by HPLC-AFS system. The atomic fluorescence (AFS) was a reliable and simple detection method for the elemental nano selenium. The elemental selenium can produce hydride in the system or can be converted to selenite with HCl/H{sub 2}O{sub 2} digestion.}
place = {Hungary}
year = {2009}
month = {Jul}
}